<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta http-equiv="X-UA-Compatible" content="IE=edge">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Document</title>
</head>
<body>
  
  <script>

    // 一个代码块
    {
      var num1 = 10
      var num2 = 20
      var result = num1 + num2
    }

    // 一个对象
    var info = {
      name: "why",
      age: 18
    }

  </script>

</body>
</html>